Found via @bruces - thanks!

Sahelsounds Contemporary pop music from the Sahara desert, where songs are stored on cellphones. Collected in Northern Mali in 2010 (since taken over by extremists who've banned music on cellphones) the second volume expands into new sonic territory - from dreamy Niger guitar ballads, Bamako club juke, to hi energy Moroccan child Raï - with a focus on the Autotuned DIY creations circulating the desert.

In much of West Africa, cellphones are are used as all purpose multimedia devices. In lieu of personal computers and high speed internet, the knockoff cellphones house portable music collections, playback songs on tinny built in speakers, and swap files in a very literal peer to peer Bluetooth wireless transfer.